| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 013/135] 9p: fix fid refcount leak in v9fs_vfs_get_link | Date | Mon, 27 Jun 2022 13:20:20 +0200 |
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From: Dominique Martinet <asmadeus@codewreck.org>
commit e5690f263208c5abce7451370b7786eb25b405eb upstream.
we check for protocol version later than required, after a fid has been obtained. Just move the version check earlier.
Link: https://lkml.kernel.org/r/20220612085330.1451496-3-asmadeus@codewreck.org Fixes: 6636b6dcc3db ("9p: add refcount to p9_fid struct") Cc: stable@vger.kernel.org Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com> Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- fs/9p/vfs_inode.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -1228,15 +1228,15 @@ static const char *v9fs_vfs_get_link(str return ERR_PTR(-ECHILD); v9ses = v9fs_dentry2v9ses(dentry); - fid = v9fs_fid_lookup(dentry); + if (!v9fs_proto_dotu(v9ses)) + return ERR_PTR(-EBADF); + p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); + fid = v9fs_fid_lookup(dentry); if (IS_ERR(fid)) return ERR_CAST(fid); - if (!v9fs_proto_dotu(v9ses)) - return ERR_PTR(-EBADF); - st = p9_client_stat(fid); p9_client_clunk(fid); if (IS_ERR(st))
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